Park Record Media Center

Mija Quigley of Princeton Junction, NJ embraces the name of her son Patrick Quigley who died aboard Flight 175 during ceremonies for the twelfth anniversary of the terrorist attacks on lower Manhattan at the World Trade Center site on September 11, 2013 in New York City. The nation is commemorating the anniversary of the 2001 attacks which resulted in the deaths of nearly 3,000 people after two hijacked planes crashed into the World Trade Center, one into the Pentagon in Arlington, Virginia and one crash landed in Shanksville, Pennsylvania. Following the attacks in New York, the former location of the Twin Towers has been turned into the National September 11 Memorial & Museum. (Photo by Chris Pedota-Pool/Getty Images) ( 180298717 )

Grissel Valentin (L) and Eileen Esquilin, who both lost family members and are both from New York, embrace at the edge of the North Pool at the 9/11 Memorial during ceremonies for the twelfth anniversary of the terrorist attacks on lower Manhattan at the World Trade Center site on September 11, 2013 in New York City. (Photo by Justin Lane-Pool/Getty Images) ( 180304351 )

A rose is left by the names engraved in the South Pool of the 9/11 Memorial during ceremonies for the twelfth anniversary of the terrorist attacks on lower Manhattan at the World Trade Center site on September 11, 2013 in New York City. (Photo by Mary Altaffer-Pool/Getty Images) ( 180305780 )

Port Authority Police Department snipers provide security at the 9/11 Memorial during ceremonies for the 12th anniversary of the terrorist attacks on lower Manhattan at the World Trade Center site on September 11, 2013 in New York City. (Photo by Allan Tannenbaum-Pool/Getty Images) ( 180306368 )

A woman mourns at the names plaques at the 9/11 Memorial during ceremonies for the 12th anniversary of the terrorist attacks on lower Manhattan at the World Trade Center site on September 11, 2013 in New York City. (Photo by Allan Tannenbaum-Pool/Getty Images) ( 180307804 )

Ruth Lamagne remembers her son, Port Authority police officer David Lamagne, at the 9/11 Memorial during ceremonies marking the 12th anniversary of the 9/11 attacks on the World Trade Center on September 11, 2013 in New York City. (Photo by Alejandra Villa-Pool/Getty Images) ( 180307850 )

Friends and family members gather at the 9/11 Memorial during ceremonies marking the 12th anniversary of the 9/11 attacks on the World Trade Center on September 11, 2013 in New York City. (Photo by Alejandra Villa-Pool/Getty Images) ( 180307857 )

Flowers stand in a name at the at the 9/11 Memorial during ceremonies for the twelfth anniversary of the terrorist attacks on lower Manhattan at the World Trade Center site on September 11, 2013 in New York City. (Photo by David Handschuh-Pool/Getty Images) ( 180308465 )

Kara Tolmie, whose sister in law Jill Ann Metzler was among the victimes, and her son Gavin, 8, of East Setauket, New York look at a book of names of those killed during ceremonies for the twelfth anniversary of the terrorist attacks on lower Manhattan at the World Trade Center site on September 11, 2013 in New York City. (Photo by David Handschuh-Pool/Getty Images) ( 180309363 )

Geraldine Davie of Pelham, New York cries after viewing name of her 23-year-old daughter Amy O'Doherty, during ceremonies for the twelfth anniversary of the terrorist attacks on lower Manhattan at the World Trade Center site on September 11, 2013 in New York City. (Photo by David Handschuh-Pool/Getty Images) ( 180309366 )

Chundera Epps, sister of victim Christopher Epps, mourns during the ringing of the first bell during the 9/11 Memorial ceremonies marking the 12th anniversary of the 9/11 attacks on the World Trade Center on September 11, 2013 in New York City. (Photo by Adrees Latif-Pool/Getty Images) ( 180300509 )

Ron Joy makes a rubbing of his friend's name, New York Fire Department firefighter Capt. Vincent Giammona, at the South reflecting pool of the 9/11 Memorial during ceremonies for the twelfth anniversary of the terrorist attacks on lower Manhattan at the World Trade Center site on September 11, 2013 in New York City. (Photo by Stan Honda-Pool/Getty Images) ( 180295873 )

Kayla Fallon, daughter of William Fallon who perished in Tower One when she was 8 years old, reacts as she attends ceremonies for the twelfth anniversary of the terrorist attacks on lower Manhattan at the World Trade Center site on September 11, 2013 in New York City. (Photo by John Angelillo-Pool/Getty Images) ( 180296004 )

Flowers and pictures left along the North Pool at the 9/11 Memorial during ceremonies for the twelfth anniversary of the terrorist attacks on lower Manhattan at the World Trade Center site on September 11, 2013 in New York City.(Photo by Justin Lane-Pool/Getty Images) ( 180300488 )

A family member of victim of the September 11, 2001 attack on the Pentagon sits in the memorial site before an observance ceremony at the Pentagon September 11, 2013 in Arlington, Virginia. Family members of victims and survivors of the attack gathered to hear from President Barack Obama and other leaders at the National 9/11 Pentagon Memorial near the place where terrorists drove a jetliner into the Department of Defense headquarters in 2001. (Photo by Chip Somodevilla/Getty Images) ( 180296308 )

Former New York CIty Mayor Rudy Giuliani (2nd L) and New York CIty Mayor Michael Bloomberg (2nd R) hold their hands over thier hearts at the 9/11 Memorial during ceremonies for the twelfth anniversary of the terrorist attacks on lower Manhattan at the World Trade Center site on September 11, 2013 in New York City. (Photo by David Handschuh-Pool/Getty Images) ( 180299943 )

A man reflects on the benches of the Pentagon Memorial at the Pentagon in Arlington, Virginia, Wednesday, September 11, 2013. There are 184 benches in the Pentagon Memorial representing the 184 people who died at the Pentagon on September 11, 2001. (Pool photo by Pat Benic/Abaca Press/MCT) ( US NEWS SEPT11 8 ABA )

Flags stand in a name on the 9/11 Memorial during ceremonies for the twelfth anniversary of the terrorist attacks on lower Manhattan at the World Trade Center site on September 11, 2013 in New York City. (Photo by David Handschuh-Pool/Getty Images) ( 180298420 )

Building are reflected in one of the pools of the 9/11 Memorial during ceremonies for the twelfth anniversary of the terrorist attacks on lower Manhattan at the World Trade Center site on September 11, 2013 in New York City. (Photo by Alejandra Villa-Pool/Getty Images) ( 180296336 )

TJ Neary pauses to remember his mother Mauriel Siskocoulos at the 9/11 Memorial during ceremonies for the twelfth anniversary of the terrorist attacks on lower Manhattan at the World Trade Center site on September 11, 2013 in New York City. (Photo by Alejandra Villa-Pool/Getty Images) ( 180296342 )

Daniel Henry, a Port Authority of New York/New Jersey police officer, pauses during a moment of silence at 9:01 am EDT, at the South reflecting pool of the 9/11 Memorial during ceremonies for the twelfth anniversary of the terrorist attacks on lower Manhattan at the World Trade Center site on September 11, 2013 in New York City. (Photo by Stan Honda-Pool/Getty Images) ( 180296458 )

U.S. President Barack Obama and first lady Michelle Obama come out from the White House to observe a moment of silence to mark the 12th anniversary of the 9/11 attacks September 11, 2013 on the South Lawn of the White House in Washington, DC. (Photo by Alex Wong/Getty Images) ( 180296538 )

A New York Police Department officer (R) salutes at the South reflecting pool at the 9/11 Memorial during ceremonies for the twelfth anniversary of the terrorist attacks on lower Manhattan at the World Trade Center site on September 11, 2013 in New York City. (Photo by Stan Honda-Pool/Getty Images) ( 180297777 )

Mayor Michael Bloomberg stands near mayoral candidate Bill de Blasio (R) during the 9/11 Memorial ceremonies marking the 12th anniversary of the 9/11 attacks on the World Trade Center on September 11, 2013 in New York City. (Photo by Adrees Latif-Pool/Getty Images) ( 180298191 )

Singer and New Yorker Billy Joel looks to the One World Trade Center while marking the 12th anniversary of 9/11 on September 11, 2013 in New York City. (Photo by John Moore/Getty Images) ( 180298254 )

A woman wipes her nose while holding a picture of a fire fighter during memorial ceremonies for the twelfth anniversary of the terrorist attacks on lower Manhattan at the World Trade Center site on September 11, 2013 in New York. AFP PHOTO/POOL/Andrew Burton /AFP/Getty Images ( 522790433 )

New Jersey Gov. Chris Christie (L) and New York Gov. Andrew Cuomo (R) hold their hands over thier hearts at the 9/11 Memorial during ceremonies for the twelfth anniversary of the terrorist attacks on lower Manhattan at the World Trade Center site on September 11, 2013 in New York City. (Photo by David Handschuh-Pool/Getty Images) ( 180298264 )

A flower sits on the 9/11 Memorial during ceremonies for the twelfth anniversary of the terrorist attacks on lower Manhattan at the World Trade Center site on September 11, 2013 in New York City. (Photo by David Handschuh-Pool/Getty Images) ( 180298419 )

A woman holds a picture at the 9/11 Memorial during ceremonies for the twelfth anniversary of the terrorist attacks on lower Manhattan at the World Trade Center site on September 11, 2013 in New York City. (Photo by David Handschuh-Pool/Getty Images) ( 180298423 )

People attend a ceremony for 9/11 victims on the 12th anniversary of the attacks on September 11, 2013 in New York City. (Photo by John Moore/Getty Images) ( 180298520 )

A first responder attends a ceremony for 9/11 victims on the 12th anniversary of the attacks on September 11, 2013 in New York City. September 11, 2013 in New York City. (Photo by John Moore/Getty Images) ( 180298524 )

One World Trade Center looms over the north reflecting pool at the 9/11 Memorial during ceremonies for the 12th anniversary of the terrorist attacks on lower Manhattan at the World Trade Center site on September 11, 2013 in New York City. (Photo by Allan Tannenbaum-Pool/Getty Images) ( 180298567 )

A attendee touches a name at the 9/11 Memorial as they attend ceremonies for the twelfth anniversary of the terrorist attacks on lower Manhattan at the World Trade Center site on September 11, 2013 in New York City. (Photo by Chris Pedota-Pool/Getty Images) ( 180299657 )

U.S. President Barack Obama wipes his brow during a ceremony in observance of the terrorist attacks of 9/11 at the Pentagon September 11, 2013 in Arlington, Virginia. Family members of the Pentagon attack victims and survivors of the attack gathered to hear from Obama and other leaders at the National 9/11 Pentagon Memorial near the place where terrorists drove a jetliner into the Department of Defense headquarters in 2001. (Photo by Chip Somodevilla/Getty Images) ( 180299673 )

U.S. Defense Secretary Chuck Hagel (R) speaks during a ceremony in observance of the terrorist attacks of 9/11 was U.S. ith President Barack Obama listens at the Pentagon September 11, 2013 in Arlington, Virginia. (Photo by Chip Somodevilla/Getty Images) ( 180299689 )

Victims' family members weep as they listen to their loved ones' names being read at the 9/11 Memorial during ceremonies for the 12th anniversary of the terrorist attacks on lower Manhattan at the World Trade Center site on September 11, 2013 in New York City. (Photo by Allan Tannenbaum-Pool/Getty Images) ( 180299697 )

Mija Quigley of Princeton Junction, NJ embraces her daughter Ruth Quigley Lawrence as they come to see the name of Mija's son and Ruth's brother Patrick Quigley who died aboard Flight 175, as they attend ceremonies for the twelfth anniversary of the terrorist attacks on lower Manhattan at the World Trade Center site on September 11, 2013 in New York City. (Photo by Chris Pedota-Pool/Getty Images) ( 180299799 )

Visitors attend the opening ceremonies at the 9/11 Memorial for the 12th anniversary of the terrorist attacks on lower Manhattan at the World Trade Center site on September 11, 2013 in New York City. (Photo by Allan Tannenbaum-Pool/Getty Images) ( 180299815 )

Steve Antoniou of Queens, brother-in-law of Edward James White III, a NYC firefighter killed on 911, holds his daughter Stella 6 as she and her sister Nikole 11 etch the name of their uncle, as they attend ceremonies for the twelfth anniversary of the terrorist attacks on lower Manhattan at the World Trade Center site on September 11, 2013 in New York City. (Photo by Chris Pedota-Pool/Getty Images) ( 180299902 )

U.S. President Barack Obama (L) delivers remarks during a ceremony in observance of the terrorist attacks of 9/11 with Defense Secretary Chuck Hagel and Chairman of the Joint Chiefs of Staff Gen. Martin Dempsey at the Pentagon September 11, 2013 in Arlington, Virginia. (Photo by Chip Somodevilla/Getty Images) ( 180300050 )

Dolores White Kresse holds an image of nephew James Patrick White while attending the 9/11 Memorial ceremonies marking the 12th anniversary of the 9/11 attacks on the World Trade Center on September 11, 2013 in New York City. (Photo by Adrees Latif-Pool/Getty Images) ( 180300313 )

A man holds up a picture of a firefighter during memorial ceremonies for the twelfth anniversary of the terrorist attacks on lower Manhattan at the World Trade Center site on September 11, 2013 in New York City. (Photo by Andrew Burton/Getty Images) ( 180300419 )

People gather around the South Tower pool during memorial ceremonies for the twelfth anniversary of the terrorist attacks on lower Manhattan at the World Trade Center site on September 11, 2013 in New York City. (Photo by Andrew Burton/Getty Images) ( 180300424 )

A woman pauses along the edge of the North Pool at the 9/11 Memorial during ceremonies for the twelfth anniversary of the terrorist attacks on lower Manhattan at the World Trade Center site on September 11, 2013 in New York City. (Photo by Justin Lane-Pool/Getty Images) ( 180300478 )

A woman pauses along the edge of the North Pool at the 9/11 Memorial during ceremonies for the twelfth anniversary of the terrorist attacks on lower Manhattan at the World Trade Center site on September 11, 2013 in New York City. (Photo by Justin Lane-Pool/Getty Images) ( 180300482 )

A view of a note left on a name at the North Pool at the 9/11 Memorial during ceremonies for the twelfth anniversary of the terrorist attacks on lower Manhattan at the World Trade Center site on September 11, 2013 in New York City. (Photo by Justin Lane-Pool/Getty Images) ( 180300483 )

A woman prays along the North Pool at the 9/11 Memorial during ceremonies for the twelfth anniversary of the terrorist attacks on lower Manhattan at the World Trade Center site on September 11, 2013 in New York City. (Photo by Justin Lane-Pool/Getty Images) ( 180300487 )

A couple pauses along the edge of the North Pool at the 9/11 Memorial during ceremonies for the twelfth anniversary of the terrorist attacks on lower Manhattan at the World Trade Center site on September 11, 2013 in New York City. (Photo by Justin Lane-Pool/Getty Images) ( 180300491 )

Family and friends of Wayne A. Russo hold his images while attending the 9/11 Memorial ceremonies marking the 12th anniversary of the 9/11 attacks on the World Trade Center on September 11, 2013 in New York City. (Photo by Adrees Latif-Pool/Getty Images) ( 180300498 )

Former New York Mayor Rudy Giuliani (L-R), New York Mayor Michael Bloomberg, New Jersey Governor Chris Christie with wife Mary Pat Christie and New York State Governor Andrew Cuomo take part in the national anthem while attending the 9/11 Memorial ceremonies marking the 12th anniversary of the 9/11 attacks on the World Trade Center on September 11, 2013 in New York City. (Photo by Adrees Latif-Pool/Getty Images) ( 180300502 )

Sgt. Keven Cottrell, of the Port Authority Emergency Services Unit, monitors Ground Zero during memorial ceremonies for the twelfth anniversary of the terrorist attacks on lower Manhattan at the World Trade Center site on September 11, 2013 in New York City. (Photo by Andrew Burton/Getty Images) ( 180300508 )

Sgt. Keven Cottrell, of the Port Authority Emergency Services Unit, monitors Ground Zero during memorial ceremonies for the twelfth anniversary of the terrorist attacks on lower Manhattan at the World Trade Center site on September 11, 2013 in New York City. T (Photo by Andrew Burton/Getty Images) ( 180300512 )

Elena, left, and Elissa Tong mourn their husband and father Thomas Tong at the South Pool of the 9/11 Memorial during ceremonies for the twelfth anniversary of the terrorist attacks on lower Manhattan at the World Trade Center site on September 11, 2013 in New York City. (Photo by Mary Altaffer-Pool/Getty Images) ( 180300631 )

New York City Firefighter Joe DePaolo pauses to remember his friend Christopher Amoroso at the 9/11 Memorial during ceremonies for the twelfth anniversary of the terrorist attacks on lower Manhattan at the World Trade Center site on September 11, 2013 in New York City. (Photo by Alejandra Villa-Pool/Getty Images) ( 180300632 )

U.S. President Barack Obama listens to military taps after laying a wreath during a ceremony in observance of the terrorist attacks of 9/11 at the Pentagon September 11, 2013 in Arlington, Virginia. Family members of the Pentagon attack victims and survivors of the attack gathered to hear from Obama and other leaders at the National 9/11 Pentagon Memorial near the place where terrorists drove a jetliner into the Department of Defense headquarters in 2001. (Photo by Kevin Dietsch-Pool/Getty Images) ( 180301999 )

U.S. President Barack Obama listens to military taps after laying a wreath during a ceremony in observance of the terrorist attacks of 9/11 at the Pentagon September 11, 2013 in Arlington, Virginia. (Photo by Kevin Dietsch-Pool/Getty Images) ( 180302003 )

New York City Police Commissioner Ray Kelly (R) hugs a friend at the South Tower reflecting pool of the 9/11 Memorial during ceremonies for the twelfth anniversary of the terrorist attacks on lower Manhattan at the World Trade Center site on September 11, 2013 in New York City. (Photo by Stan Honda-Pool/Getty Images) ( 180302153 )

Two people with shirts commemorating New York City Fire Department firefighter Frankie Esposito sit at the South Tower reflecting pool of the 9/11 Memorial during ceremonies for the twelfth anniversary of the terrorist attacks on lower Manhattan at the World Trade Center site on September 11, 2013 in New York City. (Photo by Stan Honda-Pool/Getty Images) ( 180302156 )

People gather at the at the South Tower reflecting pool of the 9/11 Memorial during ceremonies for the twelfth anniversary of the terrorist attacks on lower Manhattan at the World Trade Center site on September 11, 2013 in New York City. (Photo by Stan Honda-Pool/Getty Images) ( 180302157 )

A member of the Port Authority Emergency Services Unit monitors Ground Zero during memorial ceremonies for the twelfth anniversary of the terrorist attacks on lower Manhattan at the World Trade Center site on September 11, 2013 in New York City. (Photo by Andrew Burton/Getty Images) ( 180302219 )

Drew Taylor pauses near the name of a New York City Fire Department firefighter at the South Tower reflecting pool of the 9/11 Memorial during ceremonies for the twelfth anniversary of the terrorist attacks on lower Manhattan at the World Trade Center site on September 11, 2013 in New York City. (Photo by Stan Honda-Pool/Getty Images) ( 180302438 )

Champaign Fire Dept. Honor Guard member Curtis Hays salutes after ringing a bell calling all fallen firefighters home who died in the line of duty, at a 9/11 remembrance ceremony hosted by the Champaign Fire and Police departments at West Side Park in Champaign, Ill., on Wed. Sept. 11, 2013. (AP Photo/News-Gazette/John Dixon) ( Sept 11 Anniversary Illinois )

A mourner pauses at the south reflecting pool of the 9/11 Memorial during a ceremony marking the 12th anniversary of the 9/11 attacks on the World Trade Center in New York, on September 11, 2013. AFP PHOTO/POOL/Mary ALTAFFER/AFP/Getty Images ( 522796003 )

Bikers ride past the US Capitol Building September 11, 2013 in Washington, DC. Motorcyclists rode in and around DC to commemorate the 12th anniversary of the September 11 terrorist attacks on the United States. AFP PHOTO/Brendan SMIALOWSKI/AFP/Getty Images ( 522798076 )

Jose Gonzales, of New York, takes a minute to reflect in front of One World Trade Center, right, during the 12th anniversary observance of the 9/11 terror attacks, Wednesday, Sept. 11, 2013 in New York. (AP Photo/Lauren Casselberry) ( Sept 11 Anniversary )

Nevaeh Lewis, left, and Jonathan Wilson move through the September 11 Memorial in Indianapolis, Wednesday, Sept. 11, 2013 where a bouquet of flowers was placed to honor the victims of the 9/11 attacks on the 12th anniversary at the base of one of two beams taken from the World Trade Center. (AP Photo/Michael Conroy) ( September 11 Annversary )

Navy Quartermaster Matthew Konchan of Johnstown, Pa., stands in a field of black-eyed Susan as he waits to participate in a wreath laying with Secretary of the Interior Sally Jewell during a memorial service at the Flight 93 National Memorial on Wednesday, Sept. 11, 2013 in Shanksville. (AP Photo/Gene J. Puskar) ( APTOPIX Sept 11 Anniversary )

Crystal Eubanks, a JROTC student at Beaumont High School, stands up flags outside the school on Wednesday, Sept. 11, 2013, in St. Louis. On Tuesday night, ROTC students put up about 3,000 flags as tribute to the people who lost their lives in the attacks of Sept. 11, 2001. Wednesday marked the 12th anniversary of the 9/11 terrorist attacks. (AP Photo/St. Louis Post-Dispatch, David Carson) ( Sept 11 Anniversary Missouri )

People walk through the "Healing Field" at Tempe Beach Park, Wednesday, Sept. 11, 2013, in Tempe, Ariz. on the 12th anniversary of the 9/11 terrorist attacks. The display has nearly 3,000 flags with the names of those who died in the 2001 attacks. (AP Photo/Matt York) ( Sept 11 Anniversary Arizona )

A firefighter stands near the entrance to the 9/11 Memorial during the 12th anniversary of the 9/11 terror attacks, Wednesday, Sept. 11, 2013 in New York. (AP Photo/Lauren Casselberry) ( Sept 11 Anniversary )

Loreen Sellitto pauses Wednesday, Sept. 11, 2013, at the Garden of Remembrance Memorial in Boston Public Garden to honor her son, Matthew, who died in the 9/11 terror attacks in in New York. The two passenger jets that crashed into the World Trade Center in New York on Sept. 11, 2001 flew out of Logan International Airport in Boston. (AP Photo/Boston Herald, Angela Rowlings) ( Sept 11 Anniversary )

Secretary of the Interior Sally Jewell, left, and Gordon Felt, center, brother of Edward P. Felt, a passenger on Flight 93, place a wreath with the help of Navy honor guard Matthew Konchan, of Johnstown, Pa., in front of the wall containing the names of the 40 crew and passengers on Flight 93 at the Flight 93 National Memorial on Wednesday, Sept. 11, 2013 in Shanksville. The boulder, top, marks the area of the plane's impact. (AP Photo/Gene J. Puskar) ( Sept 11 Anniversary )

People walk through the "Healing Field" at Tempe Beach Park, Wednesday, Sept. 11, 2013, in Tempe, Ariz. on the 12th anniversary of the 9/11 terrorist attacks. The display has nearly 3,000 flags with the names of those who died in the 2001 attacks. (AP Photo/Matt York) ( Sept 11 Anniversary Arizona )

Kellen Savoy, center, helps present the colors as students raise the flag at William Lloyd Meador Elementary School on Wednesday, Sept. 11, 2013, in Willis, Texas. Students and teachers gathered before school to raise the flag to half staff to mark the 12th anniversary of the 9/11 terrorist attacks. (AP Photo/ The Courier, Jason Fochtman) ( Sept 11 Anniversary Texas )

Women pause at the Cantor Fitzgerald section of the reflecting pool at the 9/11 Memorial before ceremonies for the 12th anniversary of the terrorist attacks on lower Manhattan at the World Trade Center site on September 11, 2013 in New York City. (Photo by Ozier Muhammad-Pool/Getty Images) ( 180314215 )

Marine veteran Andrew Lahey waits for 8:03 a.m. at the flagpole on the TCU campus where he will play Taps to honor the victims of 9/11 on Wednesday, Sept. 11, 2013 in Fort Worth. Americans marked the 12th anniversary of the Sept. 11 terrorist attacks on Wednesday with the reading of the names, moments of silence and serene music that have become tradition. At a morning ceremony on the 2-year-old memorial plaza at the site of the World Trade Center, relatives recited the names of the nearly 3,000 people who died when hijacked jets crashed into the twin towers and the Pentagon and near Shanksville, Pa. They also recognized the victims of the 1993 trade center bombing. (AP Photo/The Fort Worth Star-Telegram, Max Faulkner) ( Sept 11 Anniversary Texas )

A worker waits for passing walkers during the 21-mile "March to the Arch" memorial walk on Wednesday, Sept. 11, 2013, in Chesterfield, Mo. Wednesday marked the 12th anniversary of the 9/11 terrorist attacks.. (AP Photo/St. Louis Post-Dispatch, Erik M. Lunsford) ( Sept 11 Anniversary Missouri )

Family members of the victims gather together around the plane crash site at the Flight 93 National Memorial during ceremonies commemorating the 12th anniversary of the 9/11 attacks on September 11, 2013 in Shanksville, Pennsylvania. (Photo by Jeff Swensen/Getty Images) ( 180313337 )

Carnations are left on names inscribed into the North Pool during 9/11 Memorial ceremonies marking the 12th anniversary of the 9/11 attacks on the World Trade Center in New York on September 11, 2013 in New York City. (Photo by Adrees Latif-Pool/Getty Images) ( 180311885 )

Mourners reacts at the 9/11 Memorial during ceremonies for the twelfth anniversary of the terrorist attacks on lower Manhattan at the World Trade Center site on September 11, 2013 in New York City. (Photo by Mary Altaffer-Pool/Getty Images) ( 180311833 )

United States Secretary of the Interior Sally Jewell speaks to an audience at the Flight 93 National Memorial during ceremonies commemorating the 12th anniversary of the 9/11 attacks on September 11, 2013 in Shanksville, Pennsylvania. (Photo by Jeff Swensen/Getty Images) ( 180310252 )

Antonio Cortes holds a photo of his daughter Adrianed Oyola while paying his respects at the South Pool of the 9/11 Memorial during ceremonies for the twelfth anniversary of the terrorist attacks on lower Manhattan at the World Trade Center site on September 11, 2013 in New York City. (Photo by Mary Altaffer-Pool/Getty Images) ( 180311826 )

Hattiesburg firefighters stand aside a memorial during the 9/11 Observance of Patriots' Day ceremony in Hattiesburg Miss., Sept. 11, 2013. (AP Photo/Hattiesburg American, Ryan Moore) ( Sept 11 Anniversary Mississippi )